"We cannot confirm whether any of your personal data was included in this breach. However, I wanted to make you aware immediately and apologise on behalf of the company,"

"We also recommend that if you are contacted by anyone asking you for personal data or passwords, such as for your bank account details, you should take all steps to check the true identity of the organisation.

Investors shrugged off the breach, and Wetherspoon shares in the company were up 2.3 per cent at 753.2p per share in early afternoon trade.